Specifications

Graph Detailed Rate of Change Data
# ./roc-calc-diskstats 2m “Jul 22 16:04:01” /root/diskstats.txt
sdb1,sdb2,sdc1 > results.txt
The above example dumps a summary (with per disk peak I/O information) to results.txt
Usage Example (Summary + Graph Data):
# export OUTPUT_CSV=1
# ./roc-calc-diskstats 2m “Jul 22 16:04:01” /root/diskstats.txt
sdb1,sdb2,sdc1 2> results.csv > results.txt
The above example dumps graph data to results.csv and the summary (with per disk peak I/O
information) to results.txt
Example Results (from results.txt)
Sample start time: Tue Jul 12 23:44:01 2011
Sample end time: Wed Jul 13 23:58:01 2011
Sample interval: 120s #Samples: 727 Sample length: 87240s
(Raw times from file: Tue Jul 12 23:44:01 EST 2011, Wed Jul 13
23:58:01 EST 2011)
Rate of change for devices dm-31, dm-32, dm-33, dm-4, dm-5, total
dm-31 peak:0.0 B/s (0.0 b/s) (@ Tue Jul 12 23:44:01 2011)
average:0.0 B/s (0.0 b/s)
dm-32 peak:398.7 KB/s (3.1 Mb/s) (@ Wed Jul 13 19:28:01 2011)
average:19.5 KB/s (156.2 Kb/s)
dm-33 peak:814.9 KB/s (6.4 Mb/s) (@ Wed Jul 13 23:58:01 2011)
average:11.6 KB/s (92.9 Kb/s)
dm-4 peak:185.6 KB/s (1.4 Mb/s) (@ Wed Jul 13 15:18:01 2011)
average:25.7 KB/s (205.3 Kb/s)
dm-5 peak:2.7 MB/s (21.8 Mb/s) (@ Wed Jul 13 10:18:01 2011)
average:293.0 KB/s (2.3 Mb/s)
total peak:2.8 MB/s (22.5 Mb/s) (@ Wed Jul 13 10:18:01 2011)
average:349.8 KB/s (2.7 Mb/s)
Graph Detailed Rate of Change Data
To help understand your specific bandwidth needs over time, SIOS has created a template
spreadsheet called diskstats-template.xlsx. This spreadsheet contains sample data which can be
overwritten with the data collected by roc-calc-diskstats.
diskstats-template
274Installation and Configuration